netdev - Re: [PATCH v3 10/15] net: ethernet: mtk-eth-mac: new driver

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Date:   Fri, 15 May 2020 15:14:59 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Edwin Peer <edwin.peer@...adcom.com>,
        DTML <devicetree@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Stephane Le Provost <stephane.leprovost@...iatek.com>,
        Jonathan Corbet <corbet@....net>,
        Networking <netdev@...r.kernel.org>,
        Sean Wang <sean.wang@...iatek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Pedro Tsai <pedro.tsai@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Fabien Parent <fparent@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@...ts.infradead.org>,
        Andrew Perepech <andrew.perepech@...iatek.com>,
        John Crispin <john@...ozen.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH v3 10/15] net: ethernet: mtk-eth-mac: new driver

On Fri, May 15, 2020 at 09:11:14AM +0200, Bartosz Golaszewski wrote:
> czw., 14 maj 2020 o 18:19 Arnd Bergmann <arnd@...db.de> napisał(a):
> >
> > On Thu, May 14, 2020 at 10:00 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> > >
> > > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> > >
> > > This adds the driver for the MediaTek Ethernet MAC used on the MT8* SoC
> > > family. For now we only support full-duplex.
> > >
> > > Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > Looks very nice overall. Just a few things I noticed, and some ideas
> > that may or may not make sense:
> >
> > > +/* This is defined to 0 on arm64 in arch/arm64/include/asm/processor.h but
> > > + * this IP doesn't work without this alignment being equal to 2.
> > > + */
> > > +#ifdef NET_IP_ALIGN
> > > +#undef NET_IP_ALIGN
> > > +#endif
> > > +#define NET_IP_ALIGN                           2
> >
> > Maybe you should just define your own macro instead of replacing
> > the normal one then?
> >
> 
> I did in an earlier version and was told to use NET_IP_ALIGN but then
> found out its value on arm64 doesn't work for me so I did the thing
> that won't make anybody happy - redefine the existing constant. :)

Hi Bartosz

I did not realise ARM64 set it to 0. As Arnd suggested, please define
your own macro.

    Andrew